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The image that I see is upside down. How do I fix the problem

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All astronomical telescopes have upside down images. This is normal and your scope is NOT broken.

You can buy an "erecting prism" diagonal which will invert the image for terrestrial viewing. Here is a link, but you must measure the hole in the telescope as they come in .965, and 1.25 inch sizes.
http://www.buy.com/prod/-928-45-degree-erecting-prism-for-schmidt-cassegrain-refractor/q/listingid/35841593/loc/111/203347786.html

Astro-telescopes would need extra glass to invert the image further dimming the images you see in the eyepiece for those very dim night sky objects. Read my Frequently Asked Questions TIP on my profile page. Your question is one of the most asked questions in the Telescope Topic.

Nothing is wrong with the telescope-- buy an erecting prism for day time viewing and use.

Posted on Apr 30, 2010

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